Wiggins was invited to address the squad by head coach Stuart Lancaster as they begin preparations for the QBE autumn internationals.
Lancaster arranged for former England footballer Gary Neville and rugby league international Kevin Sinfield to deliver similar motivational messages during the RBS 6 Nations championship.
England lock Mouritz Botha Tweeted: "Our guest speaker was only Bradley Wiggins!!!! Very inspirational."
England open their autumn campaign against Fiji on November 10 before tackling Australia, South Africa and New Zealand on consecutive Saturdays at Twickenham.
The squad are training at the Football Association's new St George's Park complex in Burton this week.
Gloucester wing Charlie Sharples tweeted: "What an awesome evening. Bradley Wiggins came in to talk to the boys! The man's a legend!!"
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The Barbarians are one of the top invitational rugby sides with a long history and classic rugby jersey.
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The Lions are ready to get their Australia tour underway. They arrive in Perth on Monday.
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The NEW All Blacks 2013/14 jersey has arrived at World Rugby Shop. Dare to wear the colors of the All Blacks.